How popular is this California to St. Louis flight route?

The California to Lambert-St Louis flight path was viewed by 18 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

What are the cheapest airlines to fly from California to St. Louis one-way?

The cheapest airlines for a one-way flight from California to St. Louis are Frontier ($66), Spirit Airlines ($94), and Sun Country Air ($123).

What are the most popular routes from California to St. Louis?

The most popular route from California to St. Louis is San Francisco - Lambert-St Louis. You may also consider Los Angeles - Lambert-St Louis or Ontario - Lambert-St Louis.

What are the cheapest flights from California to St. Louis?

Looking for the cheapest flight from California to St. Louis? While on average our users pay $325, our data indicates the cheapest price to be $138. The most popular route (San Francisco - Lambert-St Louis), is priced around $226.

What are the most reliable airlines from California to St. Louis?

The top 3 most reliable airlines when flying from California to St. Louis are Southwest (94%), Qatar Airways (79%) and Qantas Airways (78%).

What are the most popular airlines that fly from California to St. Louis?

American Airlines, Alaska Airlines and Delta are the most popular airlines when flying from California to St. Louis.

How far in advance should I book a flight from California to St. Louis?

Users have found that booking a flight from California to St. Louis at least 61 days early can save you up to 51% on average compared to booking a flight this week. If booking 61 days before your flight isn’t an option for you, users have found flights from California to St. Louis for as little as $372 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $536 for flights departing within the next 3 days.

What is the cheapest month to fly from California to St. Louis?

August can be a great time to fly to St. Louis from California with a flight ticket averaging about $398. Cheapflights users have found deals in the month of August for as cheap as $170. The most expensive prices can be found in the month of December.

What airport do you fly into for flights to St. Louis from California?

Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly into when you book flights from California to St. Louis.

Can I find deals for flights from California to St. Louis that include hotel bookings?

Yes. In addition to deals on California to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from California to St. Louis?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from California to St. Louis.

Can I find deals for business class flights from California to St. Louis?

Yes. Cheapflights offers flight deals from California to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$66+ Flights from California to St. Louis

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Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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Cheap flight deals from California to St. Louis

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$110 (Cheapflightsfares)
One-way from	$66 (Kiwi.com)
Popular in	December
Cheapest in	August
Average price	$376
Good round-trip deal	$348 or less
Good one-way deal	$178 or less

Provider with most accurate pricing for Los Angeles-Lambert-St Louis flight deals.

Search Deals

Provider most trusted by Cheapflights users for Los Angeles-Lambert-St Louis flights.

Search Deals

From California to Lambert-St Louis

Search Deals

One-way flight from California to Lambert-St Louis

Search Deals

Highest demand for flights based on searches. 5% potential increase in price ($24 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

Price to beat on a round-trip flight from California to Lambert-St Louis.

Search Deals

Price to beat on a one-way flight from California to Lambert-St Louis.

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Find flight deals from California to St. Louis

Cheapest flights from California to St. Louis
Explore the most affordable flight options available from California to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 17, 2025.

Fri 5/23:39 pmLAS - STL

Nonstop3h 26mFrontier

Sun 5/49:55 pmSTL - LAS

Nonstop3h 46mFrontier

Deal found 4/16

$110

Tue 4/2212:59 amONT - STL

1 stop7h 02mFrontier

Sat 4/266:58 pmSTL - ONT

1 stop7h 01mFrontier

Deal found 4/16

$178

Wed 4/3012:20 pmSNA - STL

1 stop24h 47mFrontier

Sat 5/38:15 pmSTL - SNA

1 stop17h 09mFrontier

Deal found 4/17

$189

Thu 4/2412:07 pmBUR - STL

1 stop19h 54mFrontier

Sat 4/266:58 pmSTL - BUR

1 stop18h 19mFrontier

Deal found 4/17

$191

Thu 5/89:00 pmSAN - STL

1 stop10h 09mFrontier

Mon 5/126:53 pmSTL - SAN

1 stop7h 20mFrontier

Deal found 4/16

$198

Thu 5/112:59 amLAS - STL

1 stop6h 10mMultiple Airlines

Sun 5/46:10 pmSTL - LAS

1 stop8h 49mMultiple Airlines

Deal found 4/16

$200

Thu 6/129:12 pmLAS - STL

1 stop11h 21mSpirit Airlines

Mon 6/1611:28 amSTL - LAS

1 stop15h 26mSpirit Airlines

Deal found 4/16

$225

Thu 7/36:24 pmLAS - STL

1 stop15h 06mSun Country Air

Sun 7/66:36 amSTL - LAS

1 stop18h 06mSun Country Air

Deal found 4/16

$255

Tue 7/299:44 amSMF - STL

1 stop6h 19mDelta

Fri 8/86:59 pmSTL - SMF

1 stop6h 35mDelta

Deal found 4/16

$257

Fri 5/96:00 amLAX - STL

2 stops25h 15mMultiple Airlines

Sat 5/1012:15 pmSTL - LAX

2 stops11h 15mMultiple Airlines

Deal found 4/17

$276

Fri 5/210:00 pmSAN - STL

1 stop9h 28mDelta

Tue 5/63:12 pmSTL - SAN

1 stop7h 14mDelta

Deal found 4/16

$277

Wed 4/303:45 pmSAN - STL

1 stop5h 30mSouthwest

Wed 5/712:15 pmSTL - SAN

Nonstop3h 55mSouthwest

Deal found 4/15

$279

Best flights from California to St. Louis
Discover carefully curated flight deals from California to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 17, 2025.

Fri 5/23:39 pmLAS - STL

Nonstop3h 26mFrontier

Sun 5/49:55 pmSTL - LAS

Nonstop3h 46mFrontier

Deal found 4/16

$110

Thu 5/112:59 amLAS - STL

1 stop6h 10mMultiple Airlines

Sun 5/46:10 pmSTL - LAS

1 stop8h 49mMultiple Airlines

Deal found 4/16

$200

Thu 6/129:12 pmLAS - STL

1 stop11h 21mSpirit Airlines

Mon 6/1611:28 amSTL - LAS

1 stop15h 26mSpirit Airlines

Deal found 4/16

$225

Thu 9/115:54 pmLAS - STL

1 stop15h 27mSun Country Air

Sun 9/1411:00 amSTL - LAS

1 stop25h 55mSun Country Air

Deal found 4/17

$245

Fri 5/94:20 pmSMF - STL

1 stop5h 38mAmerican Airlines

Tue 5/135:00 amSTL - SMF

1 stop7h 33mAmerican Airlines

Deal found 4/17

$257

Sun 5/410:00 pmSMF - STL

1 stop9h 36mDelta

Fri 5/91:09 pmSTL - SMF

1 stop7h 41mDelta

Deal found 4/17

$267

Thu 5/14:02 pmSAN - STL

1 stop5h 56mUnited Airlines

Tue 5/61:41 pmSTL - SAN

2 stops8h 43mUnited Airlines

Deal found 4/17

$278

Wed 4/303:45 pmSAN - STL

1 stop5h 30mSouthwest

Wed 5/712:15 pmSTL - SAN

Nonstop3h 55mSouthwest

Deal found 4/15

$279

Fri 5/212:58 pmSMF - STL

1 stop9h 01mAlaska Airlines

Tue 5/66:30 amSTL - SMF

1 stop7h 34mAlaska Airlines

Deal found 4/17

$296

Tue 4/2912:59 amONT - STL

1 stop7h 02mFrontier

Sat 5/38:15 pmSTL - ONT

1 stop5h 44mFrontier

Deal found 4/17

$178

Tue 6/311:51 amONT - STL

1 stop10h 13mHawaiian Airlines

Tue 6/103:03 pmSTL - ONT

1 stop9h 43mHawaiian Airlines

Deal found 4/16

$378

Wed 4/3012:20 pmSNA - STL

1 stop24h 47mFrontier

Sat 5/38:15 pmSTL - SNA

1 stop17h 09mFrontier

Deal found 4/17

$189

Last-minute flights from California to St. Louis
Discover last-minute flight deals from California to St. Louis. Data last updated April 17, 2025 and is based on user searches.

Tue 4/2212:59 amONT - STL

1 stop7h 02mFrontier

Sat 4/266:58 pmSTL - ONT

1 stop7h 01mFrontier

Deal found 4/16

$178

Tue 4/2212:20 pmSNA - STL

1 stop19h 41mFrontier

Thu 4/249:55 pmSTL - SNA

1 stop22h 53mFrontier

Deal found 4/17

$191

Thu 4/243:43 pmLAS - STL

Nonstop3h 22mFrontier

Sun 4/279:55 pmSTL - LAS

Nonstop3h 44mFrontier

Deal found 4/15

$110

Thu 4/2412:07 pmBUR - STL

1 stop19h 54mFrontier

Sat 4/266:58 pmSTL - BUR

1 stop18h 19mFrontier

Deal found 4/17

$191

Thu 4/2412:59 amLAS - STL

1 stop7h 02mMultiple Airlines

Sun 4/276:10 pmSTL - LAS

1 stop8h 49mMultiple Airlines

Deal found 4/16

$235

Fri 4/256:25 amSAN - STL

1 stop25h 36mFrontier

Sun 4/279:55 pmSTL - SAN

2 stops22h 33mFrontier

Deal found 4/15

$278

Fri 4/2512:03 pmSMF - STL

1 stop19h 58mFrontier

Sun 4/279:55 pmSTL - SMF

1 stop22h 59mFrontier

Deal found 4/16

$281

Fri 4/256:00 amOAK - STL

1 stop5h 28mDelta

Sun 5/47:40 amSTL - OAK

1 stop6h 33mDelta

Deal found 4/16

$343

Fri 4/259:00 amLAX - STL

2 stops24h 22mMultiple Airlines

Sun 4/276:10 pmSTL - LAX

2 stops27h 49mMultiple Airlines

Deal found 4/16

$345

Fri 4/256:15 amSAN - STL

2 stops27h 07mMultiple Airlines

Sun 4/276:10 pmSTL - SAN

2 stops32h 32mMultiple Airlines

Deal found 4/15

$357

Fri 4/257:46 amOAK - STL

2 stops24h 15mMultiple Airlines

Mon 4/289:55 pmSTL - OAK

1 stop21h 40mMultiple Airlines

Deal found 4/16

$396

Sun 4/2712:47 amSFO - STL

1 stop7h 43mDelta

Wed 4/3012:46 pmSTL - SFO

1 stop9h 29mDelta

Deal found 4/16

$343

One-way flights from California to St. Louis
Search for one-way flight options from California to St. Louis. Find affordable one-way fares based on user searches. Data last updated April 17, 2025.

Fri 7/48:20 amLAS - STL

Nonstop3h 22mFrontier

Deal found 4/17

$66

Fri 5/912:59 amONT - STL

1 stop7h 00mFrontier

Deal found 4/16

$89

Thu 5/16:25 amSAN - STL

1 stop12h 40mFrontier

Deal found 4/17

$93

Sat 5/249:24 pmLAS - STL

1 stop9h 51mSpirit Airlines

Deal found 4/16

$94

Tue 4/2212:20 pmSNA - STL

1 stop19h 41mFrontier

Deal found 4/17

$96

Mon 5/191:18 pmSMF - STL

1 stop5h 47mFrontier

Deal found 4/16

$99

Thu 5/86:58 pmSAN - STL

1 stop24h 07mMultiple Airlines

Deal found 4/17

$100

Thu 5/112:06 pmBUR - STL

1 stop19h 03mFrontier

Deal found 4/17

$106

Fri 6/66:24 pmLAS - STL

1 stop15h 01mSun Country Air

Deal found 4/17

$123

Sat 5/1711:59 pmSMF - STL

1 stop7h 00mAmerican Airlines

Deal found 4/16

$124

Tue 5/2012:05 pmBUR - STL

2 stops19h 54mMultiple Airlines

Deal found 4/17

$124

Thu 5/88:36 pmBUR - STL

2 stops34h 39mSpirit Airlines

Deal found 4/17

$125

Cheapflights Fare Finder

Use the filters below to find and compare flights from California to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Las VegasSt. Louis

LAS - STL

LASSTL

Las Vegas Harry Reid Intl

Fri 5/2

3:39 pm-9:05 pm

Nonstop3h 26m

Lambert-St Louis

Sun 5/4

9:55 pm-11:41 pm

Nonstop3h 46m

$110

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Tue 4/29

12:59 am-10:01 am

1 stop7h 02m

Lambert-St Louis

Sat 5/3

8:15 pm-11:59 pm

1 stop5h 44m

$178

Santa AnaSt. Louis

SNA - STL

SNASTL

Santa Ana J. Wayne/Orange Cnty

Wed 4/30

12:20 pm-3:07 pm

1 stop24h 47m

Lambert-St Louis

Sat 5/3

8:15 pm-11:24 am

1 stop17h 09m

$189

BurbankSt. Louis

BUR - STL

BURSTL

Burbank Bob Hope

Sun 5/4

12:06 pm-9:09 am

1 stop19h 03m

Lambert-St Louis

Sat 5/10

8:15 pm-11:16 am

1 stop17h 01m

$191

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Thu 5/8

9:00 pm-9:09 am

1 stop10h 09m

Lambert-St Louis

Mon 5/12

6:53 pm-12:13 am

1 stop7h 20m

$198

Las VegasSt. Louis

LAS - STL

LASSTL

Las Vegas Harry Reid Intl

Thu 5/1

12:59 am-9:09 am

1 stop6h 10m

Lambert-St Louis

Sun 5/4

6:10 pm-12:59 am

1 stop8h 49m

$200

Las VegasSt. Louis

LAS - STL

LASSTL

Las Vegas Harry Reid Intl

Thu 6/12

9:12 pm-10:33 am

1 stop11h 21m

Lambert-St Louis

Mon 6/16

11:28 am-12:54 am

1 stop15h 26m

$225

Las VegasSt. Louis

LAS - STL

LASSTL

Las Vegas Harry Reid Intl

Thu 9/11

5:54 pm-11:21 am

1 stop15h 27m

Lambert-St Louis

Sun 9/14

11:00 am-10:55 am

1 stop25h 55m

$245

SacramentoSt. Louis

SMF - STL

SMFSTL

Sacramento Intl

Fri 5/9

4:20 pm-11:58 pm

1 stop5h 38m

Lambert-St Louis

Tue 5/13

5:00 am-10:33 am

1 stop7h 33m

$257

SacramentoSt. Louis

SMF - STL

SMFSTL

Sacramento Intl

Sun 5/4

10:00 pm-9:36 am

1 stop9h 36m

Lambert-St Louis

Fri 5/9

1:09 pm-6:50 pm

1 stop7h 41m

$267

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 60 results

...

Best time to book a flight from California to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from California with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from California to St. Louis

What is the cheapest month to book a flight from California to St. Louis?

Currently, August is the cheapest month in which you can book a flight from California to St. Louis (average of $311). Flying from California to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from CA to STL?

When flying from California to St. Louis, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in St. Louis by month

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

See what other customers who have flown with Alaska Airlines, Southwest and Delta from California to St. Louis have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,882 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Alaska Airlines

8.0

Very good

9,882 reviews

Alaska Airlines

8.0

Very good

9,882 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Southwest

8.0

Very good

4,280 reviews

Alaska Airlines

8.0

Very good

9,882 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Delta

8.0

Very good

7,917 reviews

Alaska Airlines

8.0

Very good

9,882 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Hawaiian Airlines

7.9

Good

2,382 reviews

Alaska Airlines

8.0

Very good

9,882 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

United Airlines

7.4

Good

8,667 reviews

Alaska Airlines

8.0

Very good

9,882 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Related info for your journey

What airport do you fly into for flights to St. Louis from California?
Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly into when you book flights from California to St. Louis.
How popular is this California to St. Louis flight route?
The California to Lambert-St Louis flight path was viewed by 18 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
What are the cheapest airlines to fly from California to St. Louis one-way?
The cheapest airlines for a one-way flight from California to St. Louis are Frontier ($66), Spirit Airlines ($94), and Sun Country Air ($123).
What are the most popular routes from California to St. Louis?
The most popular route from California to St. Louis is San Francisco - Lambert-St Louis. You may also consider Los Angeles - Lambert-St Louis or Ontario - Lambert-St Louis.
What are the most reliable airlines from California to St. Louis?
The top 3 most reliable airlines when flying from California to St. Louis are Southwest (94%), Qatar Airways (79%) and Qantas Airways (78%).
What are the cheapest flights from California to St. Louis?
Looking for the cheapest flight from California to St. Louis? While on average our users pay $325, our data indicates the cheapest price to be $138. The most popular route (San Francisco - Lambert-St Louis), is priced around $226.
Can I find deals for flights from California to St. Louis that include hotel bookings?
Yes. In addition to deals on California to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from California to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from California to St. Louis.
Can I find deals for business class flights from California to St. Louis?
Yes. Cheapflights offers flight deals from California to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from California to St. Louis?
Currently, August is the cheapest month in which you can book a flight from California to St. Louis (average of $311). Flying from California to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Fenton

Maryland Heights

Fairview Heights

Collinsville

Wentzville

Eureka

St. Peters

Festus

Glencoe

Alton

Farmington

Chesterfield

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Top 7 airlines flying from California to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$66	Average$266	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$108	Average$213	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$189	Average$384	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$202	Average$394	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$246	Average$437	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$299	Average$461	FlexibilityNo cancel fee	On-time63%
Alaska Airlines	Cheapest$327	Average$737	FlexibilityNo cancel fee	On-time75%

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$66+ Cheap flights from California to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/4. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from California to St. Louis with Cheapflights

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Cheap flight deals from California to St. Louis

Keep the following information in mind while searching for California to St. Louis flight deals. Data was last updated April 17, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from California to St. Louis

Cheapest flights from California to St. LouisExplore the most affordable flight options available from California to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 17, 2025.

Explore the most affordable flight options available from California to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 17, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from California to St. Louis that are best for you.

Best time to book a flight from California to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from California with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from California to St. Louis

What is the cheapest month to book a flight from California to St. Louis?

What is the cheapest time of day to fly from CA to STL?

Find hourly flight availability from California to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 17, 2025.

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

Reviews of airlines servicing St. Louis

See what other customers who have flown with Alaska Airlines, Southwest and Delta from California to St. Louis have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from California to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to St. Louis from California?

How popular is this California to St. Louis flight route?

What are the cheapest airlines to fly from California to St. Louis one-way?

What are the most popular routes from California to St. Louis?

What are the most reliable airlines from California to St. Louis?

What are the cheapest flights from California to St. Louis?

Can I find deals for flights from California to St. Louis that include hotel bookings?

How can I find direct flights from California to St. Louis?

Can I find deals for business class flights from California to St. Louis?

What is the cheapest month to book a flight from California to St. Louis?

Traveling to a place near California?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for California to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.

Top 7 airlines flying from California to St. Louis

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Cheapest flights from California to St. Louis
Explore the most affordable flight options available from California to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 17, 2025.